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When Is Seeing Believing?

Digital technology for manipulating images has subverted the certainty of photographic evidence

By William J. Mitchell

The Terror Birds of South America

These huge, swift creatures were the dominant carnivores of the continent for millions of years, until competitors drove them into extinction

By Larry G. Marshall

The Molecular Architects of Body Design

Putting a human gene into a fly may sound like the basis for a science fiction film, but it demonstrates that nearly identical molecular mechanisms define body shapes in all animals

By William McGinnis and Michael Kuziora

The Future of American Defense

U.S. forces were shaped for conflict with a superpower. The emerging multilateral world calls for a smaller, more flexible and far less expensive military

By Philip Morrison, Kosta Tsipis and Jerome Wiesner

Particle Metaphysics

In the aftermath of the Superconducting Super Collider's death, physicists are divided over how--or even whether--they should continue their search for a unified theory of nature

By John Horgan

Liquid Mirrors

Light, liquid-mercury mirrors, which can potentially be made much larger than glass mirrors, may enable astronomers to construct enormous telescopes and see farther than ever before

By Ermanno F. Borra

AIDS and the Use of Injected Drugs

The AIDS epidemic continues to grow among drug users who inject. It could be curbed if governments more readily adopted effective prevention programs

By Don C. Des Jarlais and Samuel R. Friedman

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